I finally got my chicken flock started about three days ago with the remnant of a neighbor's flock after she gave up on them. I got some easter eggers and one white Leghorn hen. The EE rooster I got is a bantam and is way too small to mate with the Leghorn hen, but we would like to get some fertile eggs from her to expand our chicken population. I have a good friend who has a flock of Leghorns and some roosters, so I am thinking about sending our hen to her flock for a while to get her bred, sort of like you'd do with a horse or a dog I guess lol. How long would be a good time to leave her there to be sure she's laying fertile eggs? And then after that, how long can we expect the eggs to keep being fertile when she's not with the rooster anymore?